https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
No one here is going to be able to prove anything. The site only closes accounts when the are certain of a fair play violation.
You can open a ticket to appeal the closure and should have received information about it via email.
That said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.
Hi all,
This morning, when I tried to login, I found out my account is closed for “violating fair play policy”. My user name is lord_islington
I would like to invite you all to review my games and see whether you can find any signs of cheating.
I use chessable for opening preparation and have subscribed to “accelerated queens Indian defence”, “master the French defence” and “beat everything with b6”. I use these systems in my games exclusively and have completed hundreds of lines in these courses. if you spot any “computerish moves”, chances are that I will be able to show it to you where the moves or lines come from on chessable.